If he can't keep a woman around while being a billionaire I'd say that mental illness is called "ego".
I knew someone who was a "mere millionaire" who had the same problem.
It's not ego. Women don't come labeled with tags that say "sincere" and "gold digger" so you can tell who loves you because you're a wonderful person and who merely loves your wallet.
That's the real ego problem. Most of us would like not to have the "love" leave when the money does. Or, for that matter, when a higher "bidder" comes along.
Not only that, but being friends with people of a different social status is not easy. I wasn't always very successful, but now I am at the point where I live a very comfortable life. The more successful I get, the more it seems that there are people who "want something" from me. It starts small, with people wanting to use my apartment complex's pool or other facilities. It has a way of snowballing into the expectation that my family will do all the driving and hosting of get-togethers. These problems only occur with friends who are of a lower economic status than us. If they reciprocated, we wouldn't care. I understand those friends aren't flush with cash, but a platter of home cooked baked chicken isn't that expensive, and some of them can't even be bothered with that. A cooler of cheap beer is within just about everyone's monetary reach; especially if I will offer you the same at a later date. But that isn't what I get out of many friendships with lower class people.
We don't have this problem with people on the same income level. They always reciprocate. I don't think about who is "up" and who is "down" monetarily, because they make an effort, and that is enough. Poor people don't seem to think about what I want in return for helping them. I don't count dollars, because I have plenty of my own. The effort in keeping a friendship is all I want to see returned. Sadly, that's very hard to find.
Rich people must struggle tremendously with the problem of someone always trying to get something from them for nothing. You see all the worst and selfish behaviors of humanity. If I were as wealthy as Notch, I would have to dress like a bum, travel the world inconspicuously, and hope nobody notices me. I don't think I would be able to handle all the "help a brother out" BS that he probably has to deal with. It must be exhausting.